From: Tom Lane <tgl@sss.pgh.pa.us>
To: Andrus Moor <eetasoft@online.ee>
Cc: pgsql-sql@postgresql.org
Subject: Re: Query runs very slowly in Postgres, but very fast in other DBMS
Date: Tue, 12 Apr 2005 01:43:10 -0400
Message-ID: <7310.1113284590@sss.pgh.pa.us> (raw)
In-Reply-To: <d3er3k$2m2d$1@news.hub.org>
References: <d3er3k$2m2d$1@news.hub.org>
"Andrus Moor" <eetasoft@online.ee> writes:
> Seq Scan on rid (cost=0.00..28698461.07 rows=32201 width=14)
> Filter: (NOT (subplan))
> SubPlan
> -> Seq Scan on dok (cost=0.00..864.29 rows=10729 width=14)
> Is it possible to speed up this query is Postgres ?
Can you switch to int4 or int8 instead of NUMERIC(12)? I think that
we don't currently consider NUMERIC hashable, and you really need a
hash subplan here. In general NUMERIC is a bad choice if you're hot
about performance, anyway. Integers or floats would be probably two
orders of magnitude faster.
regards, tom lane
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To: pgsql-sql@postgresql.org
Cc: tgl@sss.pgh.pa.us, eetasoft@online.ee
Subject: Re: Query runs very slowly in Postgres, but very fast in other DBMS
In-Reply-To: <7310.1113284590@sss.pgh.pa.us>
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